On Wednesday, 18 July 2012 at 07:30:10 UTC, Marco Leise wrote:
Am Sun, 15 Jul 2012 19:17:11 +0200
schrieb Philippe Sigaud <philippe.sig...@gmail.com>:
[…]
auto distance = 100.km;
auto speed = 120.km/hour;
auto timeToDestination = distance/speed; // timeToDest is a
time (seconds)
The version on Github is grossly limited (it's just a sketch),
but it gives
an idea of what's possible. My goal is to code a generic unit
system
generator, given user inputs such as a list of units and
sub-units.
[…]
Sounds fun. I mean, it makes me happy to see code written like
this instead of
Distance distance = new Kilometers(100);
Speed speed = Speed.fromDistanceByTime(new Kilometers(120), new
Hours(1));
I find multiplication to read much more natural:
---
enum km = kilo * meter;
auto distance = 100.0 * km;
auto speed = 100.0 * km / hour;
auto timeToDest = distance / speed;
---
See http://klickverbot.at/code/units/ for a slightly neglected
implementation of this scheme. It supports stuff like defining
new units with arbitrary (potentially runtime) conversion
factors, properly typechecked affine units (think degrees
celsius), etc. – but any error messages and symbol names will
probably look like if the compiler had a seizure.
David
